not sure if I'm ovulating

I'm wondering if someone can give me some advice. my hubby and I have been TTC since august with no luck. I know its only been a couple of months so I'm not worried, but I am wondering if I am ovulating.

I have always had regular periods; anywhere from 28 to 30 day cycle. glow was spot,on with tracking when my,period would come,in Sept and,I got it exactly,on the date it predicted. ive been looking at glow to see when my fertile week is and when my ovulation day is and have been sure to have sex during that time;however, I have also been using opk by clear blue since the last day of my period and they have yet to say they are positive. I even tried teating 2 times a day and nothing. I passed the fertile window and still no ovulation. now I'm wondering if maybe I'm not ovulating or maybe the glow tracker is off with my ovulation?,I feel a,little crampy today and yesterday but once again did an ovulation test yesterday (2 times) and this AM and no positive reading. has this happened to anyone ?

thanks !